Two sound waves of wavelengths $5m$ and $6m$ formed $30$ beats in $3$ seconds. The velocity of sound is .... $ms^{-1}$
Medium
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(a) No of beats, $x = \Delta n = \frac{{30}}{3} = 10\,Hz$
==> Also $\Delta n = v\left[ {\frac{1}{{{\lambda _1}}} - \frac{1}{{{\lambda _2}}}} \right] = v\,\left[ {\frac{1}{5} - \frac{1}{6}} \right]=10$
==>$v = 300\,m/s$
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